I think there is a difference in spectrum of tone as opposed to characters not fitting an appropriate tone. So I think Thor and ANt Man wouldn't be a s fun if they were as serious as Black Panther and Captain America. Or, even moreso, many people would have hated Black Panther and Captain America had they had the same tone as Thor Ragnarok or ANt Man or Guardians of the Galaxy. I grew up enjoying Ambush Bug and the Keith Giffen Justice League International, with Crisis on Infinite Earths & New Teen Titans in between. Huge tonal range...but they were ALL a part of the same DC Universe I enjoyed. Had Teen Titans played like Ambush Bug (or the Teen Titans Go of today), I would've hated it... but it was great for the characters and how they were treated. Though I think GotG2 and Rangnarok were at times a bit over the top...it still felt a part of the same universe. I think the other thing @Christopher pointed out was the inconsistency of how Superman was portrayed... as a menace the first 2 films, to a beloved hero that everyone mourned in Justice League. That just didn't seemed to vibe... I mean a Captain America montage of the in-between years (where Cap went from mascot to bona-fide hero and leader) would've have helped that make sense. The thing is Geoff Johns was supposed to be that for the DC FU....but Snyder seemed to ignore him/ not have a working relationship with him (as opposed to Patty Jenkins, who seemed to work really well with Johns) Well, for me, it was specifically CHALLENGE of the Super Friends that I really really liked. (and that one episode where Superman switched places with his evil self). What I think many fans would like is a movie that respects previous adaptations , and evokes some of those fond memories, while being it's own thing. I think the Raimi SPiderman movies and DCTV's Flash do that -- and thus helped with the popularity of those. Flash and Supergirl have used actors from previous incarnations , and did so in a smart way, so that those characters were embraced, while still allowed to be its own thing.